FSH and LH are produced by the brain in order to control the production and release of sex hormones including testosterone and estrogen. FSH and LH regulate the development, growth and reproductive processes of the body. In aging men and women, a rise in FSH and LH indicates the onset of menopause and/or andropause. In women that are still menstruating, low levels of FSH and LH may indicate excessive estrogen and may lead to estrogen dominance. In this hormonal state there is an increased risk for disorder such as polycystic ovarian disease and fibrocystic breast disease. See Resources to learn more about LH and how to use it to test, monitor, and detect patients using testosterone or synthetic hormones.